Manually calling lineEdit's textChanged

root

How to force call of lineEdit's textChanged at startup?
The workaround is:
@MainWindow::MainWindow(QWidget *parent) :
...
QString s = ui->vectorEdit->text()+" ";
ui->vectorEdit->setText(s);@

How to do it properly? And without adding a space.

JKSH

-You can subclass the QLineEdit and make it emit the signal in its constructor-

Edit: Sorry, I just realized you can't emit signals in a constructor, because you don't have time to connect it to a slot first!

root

And how to use such subclasses in Designer? If there is no way of inheritance?

JKSH

You can "promote" your custom widget to use it in Designer (see http://qt-project.org/doc/qt-4.8/designer-using-custom-widgets.html#promoting-widgets ). You can't see it in Designer though; there will be a blank space.

Without using inheritance, you can create a signal in your QMainWindow, connect that signal to QLineEdit::textChanged(), and make your QMainWindow emit that signal.

@
MainWindow : public QMainWindow
{
...
signals:
void started(QString);

public:
MainWindow(QWidget *parent) : QWidget(parent)
{
connect(this, SIGNAL(started(QString)),
ui->vectorEdit, SIGNAL(textChanged(QString)));

    emit started(ui->vectorEdit->text());
}

};
@

JKSH

Sorry, I just realized you can’t emit signals in a constructor, because you don’t have time to connect it to a slot first!